He was sent back to the 21st century to loot art treasures. When he was found by the Eighth Doctor, Fitz and trix, a fight broke out. Sund obtained what he had been sent to get, a painting of Dusha. He escaped using his transit belt, inadvertently bringing the Doctor along with him.
Arriving outside Sverdlovsk, Sund was determined to get the painting to Rinzhal. He managed to do so, his determination keeping him going long after he should have died from the damage he had received from time travelling. (PROSE: Emotional Chemistry)